get() get(string $key) : mixed Retrieve the data for a key. Parameters string $key Key. Returns mixed — Data value.
set() set(string $key, mixed $value = null) Set the data for a key. Parameters string $key Key. mixed $value Value. If null, clears the key value.
exists() exists(string $key) : boolean Does the key exist? Parameters string $key Key. Returns boolean — Does the key exist?